idream is right, as always
For the CommonApp essay, you can choose any topic you want, there are no specific topics per se( However, there are few essay topics, but the list is not finite).
As for the College Supplements, you can always Google them, however:Why "insert college name" ?? essay is very common-as idream already said.
For the college list, IMO you should match all colleges through CC's Super Match search tool to find a school within your range, you should have a couple of financial safeties as well( As the Parents here rightly say ).
Finally, come March, We stand together my friend!!